000			01927nam a2200205Ia 4500
008			220216s9999 xx 000 0 und d
100			_aNair N U
245		0	_aLutoid membrane composition as a marker for yield in Hevea brasiliensis
260			_bIRRDB symposium on physiological and molecular aspects of the breeding of Hevea brasiliensis 6-7 November 1995 _c1995
300			_a42-46
520			_aLatex flow is a primary factor which determines the physiological limit of rubber yield. It has been suggested that the stability of lutoids is a major factor controlling flow. A strong positive correlation exists between plugging index (a measure of the magnitude of latex vessel plugging) and brusting index (a measure of lutoid instability). Although these indices are clonal characters strongly correlated with yield, they have limitations when used as breeding parameters in that it is not known whether the physiological phenomena expressed by these indices are heritable in a simple manner. Hence, attempts were made to identify stable biochemical markers related to yield. We were able to identify two characters related to lutoid membrane composition which showed a high correlation with brusting index and plugging index and thereby yield. Lutoids were isolated from latex samples of high and low yielding clones of Hevea brasiliensis. The phospholipid content of the bottom fraction and protein content of the lutoid membrane were estimated in eight clones with four replicates per clone. The results showed a strong negative correlation of these two parameters with brusting index and plugging index. The possibility of using these parameters for screening clones for yield is discussed.
650			_aBursting index
650			_aHevea brasiliensis
650			_aLatex flow yield
650			_aLutoid stability
650			_aPlugging index
700			_aSreelatha S
700			_aThomas M
942			_cJS
999			_c62335 _d62335